readHidden.go

package main

import (
	"os"

	"golang.org/x/crypto/ssh/terminal"
)

func readHiddenFromTTY(prompt string) (string, error) {
	tty, err := os.OpenFile("/dev/tty", os.O_RDWR, 0)
	if err != nil {
		return "", err
	}

	if len(prompt) > 0 {
		_, err = tty.Write([]byte(prompt))
		if err != nil {
			_ = tty.Close()
			return "", err
		}
	}

	buf, err := terminal.ReadPassword(int(tty.Fd()))

	if len(prompt) > 0 {
		if _, err2 := tty.Write([]byte{'\n'}); err == nil {
			err = err2
		}
	}

	if err2 := tty.Close(); err == nil {
		err = err2
	}
	return string(buf), err
}